Sensation and Perception Flashcards
What is sensation?
detection of stimuli by sensory receptors;
physiological process
what is perception?
way that sensory information is interpreted,
organized, & consciously experienced; psychological
process
what is the Absolute Threshold?
minimum amount
of stimulus energy that must be present for
the stimulus to be detected 50% of the time
what is Just noticeable difference (JND)?
the
minimum difference in stimuli required to
detect a change or a difference between stimuli
What is Bottom-up processing?
system in which perceptions are
built from sensory input. Quickly making sense of
stimuli that are sensed. ( what am i seeing?)
what is Top-down processing?
interpretation of sensations is
influenced by available
knowledge, experiences, &
thoughts ( is this something ive seen before?)
What does the cornea do?
Serves as protection,Focuses most of the light coming
into the eye
what is the Pupil?
Small opening in the eye through which light passes. Can increase in size to allow more light in, or decrease to reduce light.
what is the Iris?
Colored portion of the eye; muscles attached to it control
pupil
what is the Lens?
Curved, transparent structure behind the pupil that provides
additional focus
what is the Retina?
Light-sensitive lining on the back of the
eyeball, final stop for light in the eye
What are the two photoreceptors?
Cones and Rods
what do Cones do?
Responsible for color vision, detailed vision, spatial
resolution
What do Rods do?
Responsible for non-color, less detailed vision and
detection of movement on periphery of visual field
What is the optic nerve?
Carries visual information from the retina to the brain